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Wearable devices control the work of a person through electronic sensors, and they are at the level of consumer electronics. This is normal for a certain deviation. The user must objectively process the data.- Please do not compare with hospital equipment about reading, this is not a medical device!- Before use, scan the QR code in the manual to download the application and connect it to the watch using the application.-For Android users: please always authorize the application access to all functions of the phone and always let it work. And please enable gps on your phone before connecting it.- Please charge it within 2-3 hours when you receive it. After a long delivery, it was turned off. Thanks! Uses a larger 1.3-inch display, larger words, clearer, high-sensitivity touch, screen can achieve various operations, smart